Improvement in fly-wheels for engines



P. E. JAY, PlyrWheel for Engine.

No. 203,623. Patented May 14,1878.

Jj gems.- v f h M mmmwhm UNITED STATES PATENT OEEIoE.

PIERRE JAY, OF BETHLEHEM, PENNSYLVANIA.

IMPROVEMENT IN FLY-WHEELS FOR ENG INES.

Specification forming part of Letters Patent No. 203,623, dated May 14,1878 application filed April 26, 1878.

To all whom it may concern:

Be it known that I, PIERRE E. JAY, of Bethlehem, in the county ofNorthampton and State of Pennsylvania, have invented a new and usefulImprovement in Steam and other Engines, of which the following is aspecification:

My invention relates to a means of preventing wheels of engines of allsorts from resting upon the dead-center, and of imparting to them a moreuniform motion; and it consists in a device by which weights are solocated and moved as always to move the wheel off the center when itcomes to rest, and to pre sent to the connecting-rod the greatestresistance when its effective force is the greatest, and its leastresistance when its effective force is the least, which is effected bythe application to the wheel A of two or more weights, B B, which areconnected to, and together revolve upon, an axis which is not concentricwith, but is eccentric from, the axis of the wheel, so that thedescending weight is at a greater distance from the center of the wheelthan is the ascending weight, and hence exercises a greater force uponit.

Figure 1 shows a form of the device in which the weights revolve upon afixed center, and are attached to and move longitudinally upon the armsof the wheel, which is specially applicable to smaller engines,sewing-machines,

foot-lathes, &c. Fig. 2 shows a form of the device in which the weightsrevolve upon a center which is movable, by means of which theireccentricity can be increased or diminished at pleasure, or can betransferred from one side to the other, either by a screw, as shown, orby a lever, if preferred, and in this form the weights are attached toarms projecting beyond the line of the wheel, and are revolved by guidesattached to the wheel.

The axis of the weights is so placed in reference to the axis of thewheel, and the posi-. tion of the crank has such relation to the armsupon which the weigh ts move, that the superior force of the descendingweight will always move the crank-pin off the center when the wheel isat rest, and the crank-pin will present to the connecting-rod thegreatest resistance as the crank approaches and passes the right angle,where the greatest force is exercised upon it, and will present theleast resistance, and will, in fact, furnish a supplemental force, as itapproaches and passes the right line, where the force of theconnecting-rod is lost.

I claim as my invention In combination with the wheel A, the weights BB, revolving upon an axis eccentric from that of the wheel, either fixedor movable, constructed and operating substantially as and for thepurpose described.

P. E. JAY.

Witnesses W. M. WENDELL, EUGENE E. WEBER.

